Method of improving safe operation of mining machinery electrics by forecasting insulation resistance

Evaluation of the operation of the fan of the combine harvester air-and-screen cleaning system when using an asynchronous electric motor as a drive

“…The upper lipped screen (5) also makes oscillatory movements, due to which and due to the air flow supplied by centrifugal fan (4), the straw fraction flows off the extension (6) of the upper lipped screen and is removed from the thresher, and the grain with spikes, which contain unthreshed grain, enters lower screen (7), on which the grain is finally separated. The grain along the grain chute of sieve boot (8) enters grain screw (9), and the spikes coming from lower screen (7) and extension (6) of the upper lipped screen (5) (passage) enter tailings screw (10) and are then fed into the finish threshing device (of autonomous type or combined with a threshing and separating device). The loss of grain cleaning downstream comprises the free grain that flows from extension (6) of the upper lipped screen (5).…”

“…To optimize the control process, we propose to use variable-frequency drive instead of a mechanical one. Electric drive will improve the efficiency of controlling the air flow velocity in the processing path and allow to take advantage of microcontroller control [6,7,8,9,10].…”